Preparation Of CuO/CeO₂ Catalysts With MOFs As Precursor For The Preferential Oxidation Of Co In H₂

PEMFCs?Proton exchange membrane fuel cells?in a variety of batteries as a clean and efficient energy conversion device has attracted great attention due to the fact that it can effectively convert chemical energy into electrical energy without any contaminant.Recently,CuO/CeO₂ catalysts have been demonstrated to be effective for CO-PROX reaction.All the methods revealed that the metal ion precursors played a significant role in the enhancement of the catalytic activity and selectivity of the CuO/CeO₂ catalysts.Therefore,development of a new precursor?MOFs?and convenient synthesis method is crucial to preparation of efficient copper ceria catalysts.?1?We employ MOF constructed from nitrogen-containing organic ligand as the precursor to generate copper ceria catalysts.Due to the existence of coordination interactions between metal ions and nitrogen atom,the adsorbed metal ions can be stabilized by the ordered nitrogen atom on the pore wall.After calcinations,the generated copper ceria catalysts exhibits more outstanding catalytic performance for CO-PROX reaction than those CuO/CeO₂ catalysts produced from impregnation method as well as the isomorphic MOF precursor without nitrogen species.The generated CuO/CeO₂ catalyst featured more well-dispersed active sites,which was evidenced by varieties of characterizations such as FT-IR,UV-vis spectroscopy,PXRD,TEM,H₂-TPR,Raman spectroscopy and XPS.The selectivity and oxidation activity of CO under hydrogen-rich stream of CuO/CeO₂ catalysts,the stability of the catalysts,and the ability to resist H₂O and CO₂ were compared.?2?The selectivity of CO-PROX has also attracted our attention.Therefore,we designed a better praseodymium-doped CuO/CeO₂ catalysts using PrCe-MOF as precursor to adsorb Cu²⁺ions.This is a new expansion of MOFs precursor method.